多自治空间数据源的k邻近查询处理

多自治空间数据源的k邻近查询处理在空间信息领域具有广泛的应用。综合分析比较现有的查询处理算法,研究并提出了多自治空间数据源环境下k邻近查询处理框架及其实现算法。实验结果表明,所提出的算法能有效地减少k邻近查询处理系统的数据传输量,减少了系统响应时间。     

总线技术在武器装备测试系统中的应用及发展

总线技术在装备测试系统中占重要地位。VXI总线因具有优良性能而成为自动测试系统的优秀平台。介绍了总线技术的发展概况,分析了装备测试的重要性,着重论述了VXI技术的应用,用事实说明VXI总线技术必将随着装备自动化测试系统的发展而发展。     

基于1553B协议的星载高速无线数据网络协议的设计*

星载无线数据网络可以解除航天器内错综复杂的线缆网的束缚,是航天器轻小型化的重要技术储备。旨在替代航天器内现有的点对点三线制的LVDS线缆,提出了一种基于脉冲超宽带(IR-UWB)技术的星载高速无线数据网络的设计方案,并重点介绍了高速无线网络协议的设计和实现。网络协议设计参考了美国军用数据总线标准MIL-STD-1553B 协议,采用时分制指令响应机制,分别对其物理层、链路层、网络层和应用层进行设计,以适应星载高速率无线数据传输的要求,具有灵活性高、可靠性高、扩展性高的特点。网络协议的IP核经过地面演示系统进行验证,实验测得应用层数据传输的误码率小于10_-10。     

基于GMM的数据仓库管理与维护

元数据管理系统是构建、管理、维护和使用数据仓库系统的核心部件。元数据管理关键在于构建一个全面的、可扩展的元数据模型,表示各种类型的元数据。本文提出了一个通用的元数据模型GMM,该模型可以有效支持数据仓库的管理和维护,如用户视图管理、个性化服务、增量刷新、数据志跟踪等。     

机群超视距作战联合战术信息系统的效能分析

建立了机群联合战术信息系统在超视距作战中综合机群的传感器、导航和火力控制系统,组织对目标协同探测、辨识和火力控制的系统模型,以及它的效能评估模型.仿真计算表明此信息系统能有效增加机群超视距作战的效能,但噪声和欺骗干扰会显著地影响它的效率.     

Military expenditures,economic growth and spatial spillovers

The relationship between economic growth and military expenditure has been the subject of a large literature in defence economics. This study analyses the influence of military expenditures on economic growth in a global perspective for the time period 2000–2010 taking spatial dimension into account. The augmented Solow model is employed to investigate the defence-growth nexus using the cross-sectional data relating to 128 countries. Following a traditional regression analysis, spatial variations in the relationships are examined utilizing different spatial econometric specifications estimated by maximum likelihood. The regressions are compared with each other via likelihood ratio tests, and the spatial Durbin model is found to be the most appropriate one suggesting that the typical least-squares model is misspecified. Empirical evidence indicates that military expenditure has a positive effect on economic growth with a significant spatial dependence for the time period under consideration.     

装备“互联网+”平台化综合保障的技术应用

“互联网+”的一个特点是从数据出发，挖掘数据中隐含的本质规律，提升信息的利用率，向用户有针对性地开展业务。在数字化装备时代，装备的研制数据与使用数据信息都是海量的。这些数据资源中隐含的规律信息正是研制部门服务用户的重要资源，也是改进设计、提升装备性能的宝贵财富。综合保障信息系统的核心，是利用数据信息与信息技术为装备的保障工作服务，正符合“互联网+”的理念。本文从“互联网+”技术的理念与途径出发，根据装备保障数据信息资源应用的特点，结合在综合保障信息系统应用中的实践，探索信息化装备保障的技术发展方向。     

战场态势估计和威胁估计

描述了战场态势、态势估计和威胁估计的概念。对态势估计从态势要素提取、态势评估推理及态势预测三方面进行了分析,重点对态势评估中的功能领域如:目标合并、协同关系推理、战场主动权指数计算、作战能力评估、重要目标估计及敌战斗序列估计等的含义、内容和实现步骤进行详细阐述。对威胁估计的内容和主要功能也进行了描述。     

对数据后处理雷达的分段卷积转发干扰研究

针对现有基于DRFM的移频干扰和分段转发干扰在对数据后处理雷达干扰时存在的不足问题,提出了一种新的分段卷积转发干扰方法。该干扰方法立足于干扰机天线收发分时体制,首先对接收到的雷达信号进行均匀分段、重新排序与噪声卷积后再进行转发。该干扰方法产生的假目标信号不仅能量大,覆盖广,而且假目标幅度差异明显,位置分布不均匀。最后的仿真结果验证了该方法的有效性。     

A guarantee rate optimization model for wastewater treatment system design under uncertainty

We consider a design problem for wastewater treatment systems that considers uncertainty in pollutant concentration levels at water sources. The goal is to optimize the selection of treatment technologies and pipeline connections, so that treated wastewater can achieve specified effluents discharge limits as well as possible. We propose a new two-stage model to optimize a set of guarantee levels, that is, the maximum concentration level of source pollutants for which treated wastewater can be compliant with discharge limits. In the first stage, treatment technologies and pipeline connections are selected. In the second stage, when pollutant concentration levels are revealed, wastewater distribution and mixing are determined. A key attractiveness of the proposed guarantee rate optimization model is that it can be simplified into a single-stage mixed-integer linear program. In our numerical experiments based on real-world pollutants data, the guarantee rate model demonstrates its advantages in terms of computational efficiency, scalability and solution quality, compared with the standard probability maximization model. Finally, the methodology proposed in this paper can also be applied to other two-stage problems under uncertainty with similar uncertainty characteristics.